Improvement in metal and rubber tires combined



J. H." GHEEVER., "METAL AND RUBBER TIRES COMBINED.

No. 86,504. Paten tedFebL 2 1869.

I V ITED STAT PATENT OFFIC JOHN H. CHEEVER.

- IMPROVEMENT IN METAL ANouuBBEa TIRES oomelws'o; 5

OF NEW YORK. a. Y,

,pecillcation forming art of Letters Patent No.-86,6M, dated .FebruaryQ, 1869.

Z1 0 all whom it .may concern.-

Be it known that 1, JOHN H.. CHEEVER, of New. York,'i-n the county and State of New York, have invented certain new and useful Improvements in India'Rubber Tires-for the Wheels of Carriages and other Vehicles," and I hereby declare the following to be a full,

clear, and exact description of the same, reference being bad to the iugs,-in whieh- 1 Figure l is a perspective view of a rubber tire combined with a metal tire in accordance with myinvention. Fig. 2 is a transverse section oi "the same, and Fig, 3 iso like section through the rubber when detached from the metalrim. Y India-rubber tires have heretoiore been applied to carriage-wheels by stretching them accompanying drawover metal rims or tires provided with dove- "tailcd or otherflshtrped grooves, or with converging flanges, to receive and hold the rubber. 'v My invention relates to the formation of rubber-tires, 'to be used with such wheels as are provided with dovetailed grooves in their rims, and theinew results and advantages attained by it can bestbe explained by first specifying the difficulties and disadvantages attending the use of. rubber tires as they have been hitherto formed.' The shape of a tire of this kind has been ordinarily rectangular, that.

part of it which extends into the grooved rim lheing of the same "size, so far as breadth or width is concerned, as that which projects from g the rim. The consequence of this is- First. As the sides of the rubber the are i straight and the sidesof the grooves are slanting, the rubber at or near the bottom of thegroove is not in perfect contact with-the sides of-the groove, and is subject to little or no lateral compression compared with that which it receives at the periphery of the rim, where the converging sides of the groove 'neares approach each other. Consequently the rubber tire can be twisted or vibrated from side to side; and when its'proiccting part is subjected. to lateral pressure, as is often the case in the passage of the wheel over uneven or rough roads, or over street-railway tracks,onc side of the rubber which is held in the metal rim.

is depressed. and, forced into thegroove, while the other side is liitedor twisted out there from, so that there is-li'ttlesecurityihat the place. r

, Second. The foregoing difficulty is also 00- casioned, in part, by thesquareor angular tread of the rubber tireegualing or exceeding in width the distance between the upperjend of the converging flanges of the dovetailed groove, so that when one side of the tire is subjected to pressure the top of the flange on upon which the rubber is'tilted,' so as'to be raised andlifted out from its grooves, and the tire is thus detached. and separated from its seat.

to wheelsoi' this kind,-it becomes necessary to devise a rubber tire which shall be free from the abovewnamed objectionable features, and this is'thc object of my invention, which con stretched over the wheel, as shown in. Figsl and 2, it may fill'e'very part; of the groove,' its converging sides of the groove, and its'apetx or highest part (forming the tread of the wheel) being less in width than the top of the groove,

It will be seen, therefore, that owing to this formation of the tire any pressure upon its tread will be transmitted uniformly to every equally against both sides of the groove. A

vproduced if thetire lie-subjected toe; lateral 1 instead oi'a directly-vertical pressure; and

rubber will remain for any length of time in formation of the tire above the metal rim, the

the opposite side forms, as it were, a fulcrum,

In order,-therefore, to give practical value sists'in the combination, with a dovetailthe width of the bottom of the dovetailed groove a in the metal rim 7), so that when flat base'resting upon the bottom of the groove, its rounded sides being in close contact with and bearingequally at every point against the and nearly equidistant from the sides of the part of the rubber, which will be pressed like result, with but little variation, will be" wheel pass'ever railway-traeks er rough bar tii qs mm a. semi-bylnrical formin mamas-without any-danger of i-lhgr'ubbet ba creas-sectiqn, gm stantially in the mamlerand; coming iieplaced. w for the purp shown agd set forth. I Having 21 w described my invention and In testimony whereof I havesign'gfi my nzmw the maunerin which thesame is ormay be tothisspecificationpefqzetwosubsgribiigg wit-- carried into efiecia, what I claim-and desire b68865.

;- to B'Qmir by Letters Patent, is l JOHN H. CHEEVER.

The combination, inwheels :-with metal Witnesses: I rims having davetailed grooves or conyerg- F. M. GEBQW, ing flanges, as described, of vulcanized rub- JOHN L. COBB. 

